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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4865da4fa31e39bcd2810034b66db108f418f4cd8de6a7ba47661c59448909' 
  AND token = 'GBbpg7ZpxiLHo1b35x/Uz5opOWGJ3ZGf80F/5tRtSCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}